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copied!<p>It looks like your main activity is using the getSupportFragmentManager() while your fragment is using getFragmentManager().</p> <p>Not sure if this is worthy of an answer post but my rating is too low to reply any other way. :)</p> <p>Edit: I believe you may also need to extend a FragmentActivity with the support library.</p> <p>See: <a href="https://stackoverflow.com/a/10609839/2640693">https://stackoverflow.com/a/10609839/2640693</a></p> <p>Edit 2:</p> <pre><code>public class MainActivityFragment extends FragmentActivity { private ViewPager mPager = null; private PagerAdapter mPageAdapter = null; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View reVal = inflater.inflate(R.layout.activity_main, container, false); mPager = (ViewPager) reVal.findViewById(R.id.pagerMainContent); mPageAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager()); mPager.setAdapter(mPageAdapter); return reVal; } private MainGridViewFragment mainGridFragment; private AlphabetGridViewFragment alphabetGridFragment; private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter { public ScreenSlidePagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { switch (position) { case 1: mainGridFragment = new MainGridViewFragment(); return (Fragment)mainGridFragment; case 0: alphabetGridFragment = new AlphabetGridViewFragment(); return (Fragment)alphabetGridFragment; default: return null; } } @Override public int getCount() { return 2; } } } </code></pre>

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